Tell whether the lines for each pair of equations are parallel, perpendicular, or neither. y=-2x+4 -5x+10y=5 a: parallel b: perpendicular c: neither

What is the distance between (–2 1/2,-3) and (1, –3)?

What is the measure of ac? 5 units 13 units 26 units 39 units

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.